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SIGNIFICANT RELATED PARTY TRANSACTIONS - Additional Information (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2014
USD ($)
Oct. 31, 2014
CNY (¥)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]                            
Reduction in service agreement charges $ 1,000 ¥ 6,000 $ 4,900 ¥ 30,000,000                    
Borrowings                       ¥ 36,348,000   ¥ 36,217,000
Stuart Management Co [Member]                            
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]                            
Payment of administrative services             $ 6,000 ¥ 40,000 $ 12,000 ¥ 81,000        
Wong Kung Tok [Member]                            
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]                            
Proceeds from borrowings, classified as financing activities         ¥ 35,057,000 ¥ 35,057,000                
Sound Treasure Limited [Member]                            
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]                            
Borrowings                     $ 167,000 1,160,000 $ 167,000 1,160,000
Alex Ng [Member]                            
Disclosure Of SIGNIFICANT RELATED PARTY TRANSACTIONS [Line Items]                            
Borrowings                     $ 20,000,000 ¥ 131,000,000   ¥ 0